Penned by Peter Flannery (Our Friends In The North) and Jimmy Gardner (This Life), the show will be filmed on location in Durham. Lee Ingleby also returns as Gently's sidekick Detective Sergeant John Bacchus.
"It's now 15 years since the BBC filmed Our Friends In The North in and around Newcastle, so it's especially rewarding for me to be back on my home patch," said Flannery.
"Fun though it was to film the earlier series in Dublin, I've long wanted the stories to unfold in the landscape in which they are truly set. I'm coming home again - and I'm bringing Inspector George Gently with me."
Guest stars in the two episodes will include Sarah Lancashire, Warren Clarke, Shaun Dooley and Daniel Casey.
BBC executive producer Kate Evans said: "Inspector George Gently continues to attract an audience who relish its unique blend of strong story-telling, a period setting and a contemporary resonance. At the heart of the show, as ever, is the complex and enjoyable relationship between Gently and Bacchus, which will continue to delight in these two new films."